man3/psignal.3

   1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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  25 .\" References consulted:
  26 .\"     Linux libc source code
  27 .\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
  28 .\"     386BSD man pages
  29 .\" Modified Sat Jul 24 18:45:17 1993 by Rik Faith (faith@cs.unc.edu)
  30 .TH PSIGNAL 3  2020-11-01 "GNU" "Linux Programmer's Manual"
  31 .SH NAME
  32 psignal, psiginfo \- print signal description
  33 .SH SYNOPSIS
  34 .nf
  35 .B #include <signal.h>
  36 .PP
  37 .BI "void psignal(int " sig ", const char *" s );
  38 .BI "void psiginfo(const siginfo_t *" pinfo ", const char *" s );
  39 .fi
  40 .PP
  41 .RS -4
  42 Feature Test Macro Requirements for glibc (see
  43 .BR feature_test_macros (7)):
  44 .RE
  45 .PP
  46 .BR psignal ():
  47     Since glibc 2.19:
  48         _DEFAULT_SOURCE
  49     Glibc 2.19 and earlier:
  50         _BSD_SOURCE || _SVID_SOURCE
  51 .PP
  52 .BR psiginfo ():
  53 _POSIX_C_SOURCE\ >=\ 200809L
  54 .SH DESCRIPTION
  55 The
  56 .BR psignal ()
  57 function displays a message on \fIstderr\fP
  58 consisting of the string \fIs\fP, a colon, a space, a string
  59 describing the signal number \fIsig\fP, and a trailing newline.
  60 If the string \fIs\fP is NULL or empty, the colon and space are omitted.
  61 If \fIsig\fP is invalid,
  62 the message displayed will indicate an unknown signal.
  63 .PP
  64 The
  65 .BR psiginfo ()
  66 function is like
  67 .BR psignal (),
  68 except that it displays information about the signal described by
  69 .IR pinfo ,
  70 which should point to a valid
  71 .I siginfo_t
  72 structure.
  73 As well as the signal description,
  74 .BR psiginfo ()
  75 displays information about the origin of the signal,
  76 and other information relevant to the signal
  77 (e.g., the relevant memory address for hardware-generated signals,
  78 the child process ID for
  79 .BR SIGCHLD ,
  80 and the user ID and process ID of the sender, for signals set using
  81 .BR kill (2)
  82 or
  83 .BR sigqueue (3)).
  84 .SH RETURN VALUE
  85 The
  86 .BR psignal ()
  87 and
  88 .BR psiginfo ()
  89 functions return no value.
  90 .SH VERSIONS
  91 The
  92 .BR psiginfo ()
  93 function was added to glibc in version 2.10.
  94 .SH ATTRIBUTES
  95 For an explanation of the terms used in this section, see
  96 .BR attributes (7).
  97 .TS
  98 allbox;
  99 lbw21 lb lb
 100 l l l.
 101 Interface       Attribute       Value
 102 T{
 103 .BR psignal (),
 104 .BR psiginfo ()
 105 T}      Thread safety   MT-Safe locale
 106 .TE
 107 .sp 1
 108 .SH CONFORMING TO
 109 POSIX.1-2008, 4.3BSD.
 110 .SH BUGS
 111 In glibc versions up to 2.12,
 112 .BR psiginfo ()
 113 had the following bugs:
 114 .IP * 3
 115 In some circumstances, a trailing newline is not printed.
 116 .\" FIXME . http://sourceware.org/bugzilla/show_bug.cgi?id=12107
 117 .\" Reportedly now fixed; check glibc 2.13
 118 .IP *
 119 Additional details are not displayed for real-time signals.
 120 .\" FIXME . http://sourceware.org/bugzilla/show_bug.cgi?id=12108
 121 .\" Reportedly now fixed; check glibc 2.13
 122 .SH SEE ALSO
 123 .BR sigaction (2),
 124 .BR perror (3),
 125 .BR strsignal (3),
 126 .BR signal (7)